Title: Cho U’s Tsumego – Making Difficult Tsumego Simpler
Author/Editor: 張栩 Cho U
Publisher Recommended Price: JPY1890
Ch 1 Tsumego from Actual Game Situations 実戦詰碁 (3 games)
Ch 2 Tsumego from Folding Fans 扇子詰碁 (10 problems)
Ch 3 Specially Selected Tsumego 特選詰碁 (24 problems)
Ch 4 Difficult Tsumego 難解詰碁 (10 problems)
Ch 5 Word-Shaped Tsumego 文字詰碁 (10 problems)
Also has many featurettes dispersed amongst the chapters.
The way Cho U makes sub-problems and related problems from his tsumego reminds me of problems from books by Kada Katsushi 加田克司.